Lighting fixture



Nov. 9 1926.

w. L.'KORNFEL D ET AL LIGHTING FIXTURE 2 Shets-Sheet 1 Filed Jul 5. 19231,605,956 w. L. KORNFELD ET AL Nov. 9 1926.

LIGHTING FIXTURE 2 Sheets-Sheet 2 Filed July 5. 1923 Patented Nov. 9,1926'.

UNITED STAT S PATEN BEIGE..-

WILLIAM L. KORNFELD AND ARTHUR R. ENGLANDER, OF'CLEVELANJ J, OHIO.

LIGHTING FIXTURE.

Application filed J'uv1y5, 1923. Serial No; 649,475.

Our present invention relates to an adjustable globe or shade supportingand at and attaching means which maybe readily adjusted when the partsare fully assembled to alter the relation between the electric lamp andthe globe or shadethereby to obtain the greatest efficiency and, in thecase of incorporating a reflector in our improved structure, to properlyfocus the lamp with respect-to the reflector.

A further object of the invention is to provide self adjusting means forconnecting a glass shade or globe to the supporting structure thereby tocompensate for expansion and contraction of the parts without danger ofimposing undue strains upon the glass; to make such attaching meansmanually adjustable so that said means may be better fitted to globes orshades having attaching portions or necks of different sizes; and sothat the shade or globe may be centered with respect to the supportingstructure; and to provide means of the aforesaid character which greatlyfacilitates the 30 attachment of the shade or globe to the supportingstructure.

For the purpose of securing our present shade or globe supporting meansto thelamp socket'we preferably employ the construe tion covered by ourco-pending application Serial No. 565,957, filed June 5, 1922, thepresent structure, in general respects, falling within the terms ofcertain claims of said application.

The objects above enumerated, with others which will appear hereinafter,are attained in the embodiment illustrated in the drawings accompanyingand constituting a part hereof and wherein Fig. liis a sectional sideelevation of a lighting fixture showing a globe sustained in properrelation'to an electric lamp by our adjustable supporting means; Fig; 2is a fragmentary elevational view at right angles to Fig. 1; Fig. 3 is aplan view of what is shown in Fig. 1; and Fig. 4 is a detail of theglobe or shade attaching means.

An electric lamp 1 is supported by a socket 2 which, in turn, issupported by the fixture element 3. Fitted about the lower end of thesocket 2, with its upper edge engaging the enlargement 4 thereof, is asleeve or shell 5. As will be noted, this shell is of two diameters, thesmaller fitting closely about the socket 2 immediately below theenlargement 4, and pivotally connected, as by-means of rivets 6, todiametrically opposits points of the smaller portion of the shell 5 is abail 7 which is adapted to be swung up over the socket 2 and engagedwith the top thereof adjacent the neck 8" which receives the fixtureelement 3, the bail 7 being notched, as shown at 10 in Fig. 3, toaccommodate the neck 8. It'will be noted that the open side ofthe notch10'is quite restricted and that the parts or tongues 11 on oppositesidesthereof' are turned down to lock the bail to the neck.

For further details of this arrangement reference may be had toour'co-pending application hereinbefore identifie i i The lower end ofthe shell 5. is formed with screw threads 12 for cooperation withsimilar threads formed in a sleeve or shell] extension 14 which isthrough this arrangement adapted to be adjusted longitudinally of theshell 5. The top edge of the shell extension or sleeve 14 is'turnedinwardly to provide a flange 15 which constitutes a stop that engagesthetop convolution of the thread 12 to prevent withdrawal of the shellextension or sleeve from theshell 5 in a downward direction. It will beobserved,

however, that all parts above the enlarged lower end of the shell 5 fallwithin the di aineter of said enlarged portion and this enables theshell extension or sleeve 14 to be screwed upwardly along the shell 5-until it is entirely disengaged from the threadsthereof, allowing theshell to be removed from the lower end of the shell extension or sleeve14, thus facilitating assembly and disassembly of the parts. v

Shown as secured to the lower end of the shell extension or sleeve. 14(although it is clearly within the scope of our invention to spin it orotherwise form it integral with said extension or sleeve) is anoutwardly and downwardly flaring part 16, which ma have its inner sidepolished or suitably finished to providea reflectlng surface, and inasmuch as it 1s our preference to so treat said part 16 we may refer toit hereinafter as the reflector. VVhile'the part is shown asfrusto-conical, it may be suitably dished in accordance with the usualform of reflectorsor, if desired, given the contour ot a true parabola.

The part 16 terminates at its lower end in a' depending flange 18 of asize to receive the neck 19 of a globe 20. The neck of the globe, asusual, is formed to provide an out wardly opening groove intowhichyextend the globe or shade attaching means 21 and 22. The'lneansdesignated 21 may be in the form of screws that are threaded throughbushings or eyelets 23 that are set within apertures of the flange 18.Said screws may be adjusted" to approximately center the neck 19 withinthe flange 18. Theattaching means to which the numeral 22 is generallyapplied comprises a plunger 25 that is guided 'within an aperture 26 ofthe flange 18 and in a hole in the outer end wall of a boxlike casing 27that is suitably secured, through its flanged inner end, with the flange18, as by means of rivets 28. The inner end portion of the plunger 25 isthreaded for cooperation with anut 29 that is guided between the opposedwalls of the casing 27 V and thus held against turning. in order todispose the inner end of the plunger 25 in proper relation to the neck19 the casing 27 is shown as inclined upwardly and outwardly to impartthe same angular position to the plunger. A spring 30is compressed between the nut 29 and the outer end wall of the casing 27 and tends tourge the nut, along with the plunger 25, inwardly to engage the innerend of the plunger with the neck of the globe 20. The outer end of theplunger is provided with a head 31 by means of which the plunger may beretracted when inserting the neck of the globe in the flange 18 orwithdrawing it therefrom or by means of which the plungermay be turnedto adjust it within the nut 29.

,By reason of the fact that the plunger 25 attaching means 21 could be,and in some instances will be, fixed withrespcct to the flange 18, anobvious construction being to displace parts of said flange inwardly toform projections that would be received by the groove of the neck.

The particular globe shown in the drawings is the same as that disclosedin our previously mentio-ned application and is no part of ourinvention. As to contour, the

"globe is curved outwardly and downwardly below the neck 19 a suitabledistance to a point designated by theline aa, and for a proper distancebelow this point to a point designated by the line bb it converges; andafter bulging outwardly rather abruptly below the line Z)b the globeagain converges to eifect a sort of semi-spherical shape. Above the lineaa, and below the line Z)Z1, the globe-is translucent; while betweensaid lines it is transparent or clear. This results in a sort ofsemi-indirect lighting effect, certain rays from the lamp beingreflected downwardly by the portion of the globe above line aa throughthe clear portion between lines a-a and bb, while other rays filterthrough the translucent portion below the latter line. In asubstantially horizontal direction, of course, direct rays escapethrough the clear portion of the globe. While it is desirable to softenthe rays descending from the lamp through the translucent lower portionof the globe, too much filtering of the light is extravagant andobjectionable and to increase the elliciency of the light penetratingthe lower portion of the globe to a very considerable extent the innersurface of the part 16 is treated in the manner herein'cefore described.To obtain the desired high brilliancy of the reflecting surface, it maybe silver plated and polished in the manner of finishing reflectors ofsuch type. lVhile most of the light reflected by the part 16 fallsthrough the translucent lower portion of the globe,'some of it will bereflected through the clear portion between the lines aa and Z2--b. Evengreater eliiciency, and with it a glare which in some instances may beobjectionable, is obtained when a shade is substituted for the'globe 20,such a substitution being so obvious as to require no furtherexplanation or specific illustration. From the foregoing description itwill be seen that our invention provides means for adjustably connectinga shade or globe to a lamp socket and which enables the shade or globeto be adjusted in order to obtain the desired relation between the shadeor globe and the lamp without having to remove the shade or globe forthe purpose. This greatly facilitates accomplishing correct adjustmentbecause the results may be observed during the time the adjustment isbeing made. The same is true of the adjustment of the reflector 16 withrespect to the lamp for the purpose of properly focusing the lamp withrespect to the reflector. In certain of the following claims, lampsurrounding member is used as a term common to both shade and globe.Having thus described our what we claim is:

1. A fixture for use with an electric lamp socket whose lamp receivingend is of lesser diameter than the remainder of its body invention,

portion, the portion of greater diameter being surrounded by anenlargement; said fixture comprising a sheet metal sleeve member havingportions spaced apart longitudinally thereof which are of differentdiameters, the portion of the smaller diameter being designed to fitabout the larger end of the lamp socket in end-t0end engagement with theaforesaid enlargement, and the portion of larger diameter extending overbut spaced radially from the lamp receiving end of said socket, the lastmentioned portion being threaded, a second sheet metal sleeve memberthreaded on said portion of larger'diameter, means for attaching a shadeor globe to the end of the second mentioned sleeve member remote fromthe lamp socket, the opposite end of said second mentioned sleeve memberhaving the peripheral edge thereof deflected inwardly to prevent itspassing over the threaded portion of the first men tioned sleeve member,and means for securing the first mentioned sleeve member to the lampsocket.

2. In combination, a pair of sleeve members, one adjustable with respectto the other, one of said sleeve members being adapted to support ashade or globe and the other of said members being adapted to fit abouta lamp socket, a bail attached to the last mentioned member, said bailbeing provided with a notch adapted to receive the neck of said socket,and means for locking said bail to said neck.

3. In combination, a pair of sleeve members, one adjustable with respectto the other, one of said sleeve members being adapted to support ashade or globe and the other of said members being adapted to fit abouta lamp socket, abail attached to the last mentioned member, said bailbeing provided with a notch adapted to receive the neck of said socket,and tongues formed on said bail and adapted to substantially close thenotch thereby to lock said bail to said neck.

4:. In combination, a lamp surrounding member having a neck formed by anupwardly diverging wall, a supporting member having parts in opposedrelation to the neck, means carried by said parts for interlockingengagement with the neck, one of said means consisting of a plunger theaxis whereof is substantially parallel to said diverging wall, andfurther means yieldingly urging said plunger axially toward the neck.

5. In combination with a lamp surrounding member having a neck formed byan up wardly diverging wall, a supporting member having parts in opposedrelation to the neck, means carried by .said parts for interlockingengagement with the neck, one of said means comprising a threadedplunger the axis whereof is substantially parallel to said divergingwall, a member through which said plunger is screwed so that the plungermay be adjusted with respect to the member, and means yieldingly urgingsaid member in a direction to project the plunger axially toward theneck.

6. In combination with alamp surrounding member having a neck that isprovided with an external groove, the top wall of which divergesupwardly, a support having a flange adapted to surround the neck, and aplurality of means carried by said flange and projecting into the grooveof the neck, one of said means consisting of a threaded plunger, theaxis whereof is substantially parallel to said diverging wall, a memberthrough which said plunger is screwed for adjustment with respectthereto, and means yieldingly urging said member inwardly so as toproject the plunger axially toward the neck. 7

7. I11 combination with a lamp surrounding member having a neck that isprovided with an external groove, the top wall of which divergesupwardly, a support having a flange adapted to surround the neck, and

a plurality of means carried by said flange and projecting into thegroove of the neck, one of said means consisting of a plunger having athreaded portion, a casing applied to the outer side of said flange, theflange and casing having, respectively, apertures in axial alignment,said plunger being guided within said apertures with its axissubstantially parallel to the aforesaid diverging wall, a nut enclosedby the casing and restrained thereby from turning, the threaded portionof the plunger 00* operating with said nut, a spring surrounding theplunger and interposed between the nut and the opposite wall of thecasing, and means for turning the plunger.

8. In combination, a lamp surrounding member having a neck that isprovided with an external groove, a support for said mem ber having aflange surrounding'the neck, means spaced apart about said flange andhaving screw thread connection therewith for adjustment toward and fromthe neck, a part sustained by the flange and yieldingly urged toward theneck, and means having screw thread connection with said part foradjustment toward and from said neck independently of the movement ofsaid part.

In testimony whereof, we hereunto affix our signatures.

WILLIAM L. KORNFELD. ARTHUR R. ENGLANDEB.

